Nasri, 26, who has contributed four goals and three assists this season, picked up the injury following a strong challenge from Mapou Yanga-Mbiwa, which resulted in the defender receiving a yellow card.

“Maybe it’s medial ligaments. We’ll see tomorrow [Monday] what happens with him,” Pellegrini told Sky Sports, after seeing goals from Edin Dzeko and Alvaro Negredo secure his side all three points.

The Chilean was also left furious at referee Mike Jones’ decision not to send off Yanga-Mbiwa for the foul on Nasri.

“It should have been a red card for the tackle by Yanga-Mbiwa on Samir Nasri. A direct red card -- we didn’t have any extra help from the referee today,” Pellegrini said.

“Nasri has a serious injury with his knee -- it was directly a red card.”